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Concentration effects on the rheology and texture of PBG/m‐cresol solutions

 

作者: Lynn M. Walker,   Martine Mortier,   Paula Moldenaers,  

 

期刊: Journal of Rheology  (AIP Available online 1996)
卷期: Volume 40, issue 5  

页码: 967-981

 

ISSN:0148-6055

 

年代: 1996

 

DOI:10.1122/1.550797

 

出版商: The Society of Rheology

 

关键词: Liquid crystalline polymers;PBG/m‐cresol solutions;Texture;Nematic fluid;Defects;SOLUTIONS;CRESOLS;CONCENTRATION RATIO;STRESS RELAXATION;LIQUID CRYSTALS;TRANSIENTS;RELAXATION TIME

 

数据来源: AIP

 

摘要:

In this work, the rheology of PBG/m‐cresol systems is reevaluated with the specific goal of understanding the influence of concentration on low shear‐rate rheology. Comparisons of steady‐state and transient rheology and the behavior after cessation of shear allow for the separation of the contributions to the stress from the nematic fluid and defect texture. Stress relaxations demonstrate that the textural contribution to the stress increases nonlinearly from 30% to 55% as the concentration increases from 12 to 37 wt %. Recoil shows a similar nonlinear trend in the magnitude of the ultimate recovered strain γ∞. Stress relaxations and recoil, once normalized, have universal dynamics dependent only on γ̇ot and independent of concentration. Two different regions of concentration are identified and correlated to a distinct change in the nature and behavior of the textural contribution to the stress.

 

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